Sergeant Mark Hill will cycle from Spain to France to help raise money for the Royal Marines Charitable Trust Fund
He is the only musician in the 30 strong team which will be cycling more than 80 miles a day in temperatures topping 30c.
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The prison watchdog has branded HMP Swaleside on the Isle of Sheppey in Kent as 'dangerous' with unacceptably high levels of violence.
Tuesday morning's forecast for the east of the region
Tuesday morning's forecast for the west of the region